B2ST, also known as Beast, is a South Korean boy band formed by Cube Entertainment in 2009. The group originally consisted of six members: Yoon Doo-joon, Yang Yo-seob, Lee Gi-kwang, Yoon Dujun, Son Dong-woon, and Jang Hyun-seung. They gained popularity for their catchy songs and impressive performances, quickly becoming one of the leading K-pop groups of their time. B2ST debuted with the single "Bad Girl" and released several successful albums, including "Fiction and Fact" and "Hard to Love, How to Love." The group is known for their diverse musical styles, blending genres like pop, R&B, and hip-hop. They officially disbanded in 2017 but have left a lasting impact on the K-pop industry.